X射线光电子能谱
光催化
纳米复合材料
电子顺磁共振
激发态
材料科学
可见光谱
带隙
光化学
化学
纳米技术
化学工程
光电子学
催化作用
原子物理学
核磁共振
有机化学
物理
工程类
作者
Xin Guo,Yanduo Liu,Yang Yang,Zhiyuan Mu,Ying Wang,Shuai Zhang,Shuai Wang,Yu‐Feng Hu,Zhichang Liu
标识
DOI:10.1016/j.jallcom.2021.161389
摘要
Designing and fabricating high-powered Z-scheme photocatalysts are highly desired to improve the visible-light activity for efficiently degrading organic pollutants. In this work, a novel all-solid-state Ag bridged BiVO4/ZnIn2S4 (BiVO4/Ag/ZnIn2S4) core-shell structure Z-scheme nanocomposite is constructed by multi-step solvothermal method with in-situ growth, in which the degradation rate of 2,4-DCP is 4 times than that of BiVO4 within 3 h. On the basis of Valence Band-X-ray photoelectron spectroscopy (VB-XPS) spectra, Kelvin probe force microscopy, single-wavelength photoactivities and DMPO spin-trapping electron paramagnetic resonance (EPR) spectra, the exceptional photoactivities of BiVO4/ZnIn2S4 core-shell structure is mainly attributed to the Z-scheme mechanism of BiVO4/ZnIn2S4 exhibits significant effect on the promotion of photogenerated charge separation within the system. Excitingly, it has been proved that the photogenerated charge of Z-scheme mechanism can be further effectively separated by introducing Ag bridges between BiVO4 and ZnIn2S4, as supported by photophysical, photochemical and photoelectrochemical tests. In practice, this work provides valuable experience for develop new core-shell structure BiVO4-based narrow band gap photocatalysts for organic degradation. In theory, it further reveals the photogenerated transfer mechanism and improvement paths in the Z-scheme system.
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